Wireless energy transfer system and method for feeding an electric load

A wireless energy transfer system comprising:

• a transmitter comprising a frequency sweeper, a radiofrequency signal generator adapted to generate a radiofrequency signal, and a first resonant circuit adapted to transmit a generated radiofrequency signal;
• and
• a receiver adapted to receive the generated radiofrequency signal and comprising a second resonant circuit having a resonant frequency,
• wherein the second resonant circuit is adapted to be located in a non-radiative near field generated by the first resonant circuit,
• wherein, based on a signal outputted by the frequency sweeper, the radiofrequency signal generator—is configured to generate a plurality of cycles of radiofrequency signals, wherein each radiofrequency signal in a cycle comprises a different frequency in a range of possible signal frequencies centered on a nominal frequency, wherein each cycle comprises at least one radiofrequency signal comprising a signal frequency that matches the resonant frequency and each cycle comprises at least one radiofrequency signal comprising a signal frequency that does not match the resonant frequency, and
• wherein each radiofrequency signal in each cycle of radiofrequency signals is transmitted by the first resonant circuit having a first impedance.